Sinmi-do

Sinmi-do is an island located in West Korea Bay off the coast of North Korea. It is the largest island of North Korea, and it used to be home to a Silla town before it was destroyed by the Liao dynasty in 920.

History
Sinmi-do was built by Silla, one of the dynasties of Korea, and it was primarily a civilian town. There were no military forces stationed on the island, with some fishing boats fishing off the island for marlin. However, they faced an enemy in the Liao dynasty, and the town of Sinmi-do was behind in technology and military power. In 920, Sinmi-do was only in the Castle Age while the Liao dynasty was in the Imperial Age, and the Liao landed a siege army that destroyed most of the buildings on the island as well as killing all of the villagers and many fishing boats. Sinmi-do surrendered to the Chinese, having been utterly destroyed. Today, it is an uninhabited island, albeit the largest in North Korea.